<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
	<style>
		.bjimg {
			position: fixed;
			top: 0;
			left: 0;
			width: 100%;
			height: 100%;
			z-index: -10;
			object-fit: cover;/*保持原有尺寸比例。但部分内容可能被剪切*/
		}
	</style>
</head>
<body>
	<video src="xiamu.mp4" class="bjimg" autoplay loop muted></video>
</body>
</html>